[FIR] Report empty intersection on responsible call

When reporting INFERRED_TYPE_VARIABLE_INTO_EMPTY_INTERSECTION, search
for a call to a declaration with the type parameter that got inferred
into an empty intersection inside the expression.

#KT-56377 Fixed

compiler/testData/diagnostics/tests/when/TypeParameterError.fir.kt

@@ -0,0 +1,34 @@
+// !LANGUAGE: +ForbidInferringTypeVariablesIntoEmptyIntersection
+// FILE: ObjectNode.java
+
+public interface ObjectNode {
+    <T extends JsonNode> T set(String fieldName, JsonNode value);
+}
+
+// FILE: JsonNode.java
+
+public class JsonNode
+
+// FILE: test.kt
+
+interface JsonObject
+class SomeJsonObject() : JsonObject
+
+fun String.put(value: JsonObject?, node: ObjectNode) {
+    select(
+        node.<!INFERRED_TYPE_VARIABLE_INTO_EMPTY_INTERSECTION_ERROR!>set<!>(this, null),
+        Unit,
+    )
+
+    if (value == null) node.<!INFERRED_TYPE_VARIABLE_INTO_EMPTY_INTERSECTION_ERROR!>set<!>(this, null)
+    else if (value is SomeJsonObject) Unit
+
+    when (value) {
+        null -> node.<!INFERRED_TYPE_VARIABLE_INTO_EMPTY_INTERSECTION_ERROR!>set<!>(this, null)
+        is SomeJsonObject -> Unit
+        else -> TODO()
+    }
+}
+
+fun TODO(): Nothing = null!!
+fun <K> select(vararg values: K): K = values[0]

compiler/testData/diagnostics/tests/when/TypeParameterError.kt

@@ -1,4 +1,3 @@
-// FIR_IDENTICAL
 // !LANGUAGE: +ForbidInferringTypeVariablesIntoEmptyIntersection
 // FILE: ObjectNode.java
 
@@ -16,6 +15,14 @@ interface JsonObject
 class SomeJsonObject() : JsonObject
 
 fun String.put(value: JsonObject?, node: ObjectNode) {
+    <!INFERRED_TYPE_VARIABLE_INTO_EMPTY_INTERSECTION_ERROR!>select<!>(
+        node.set(this, null),
+        Unit,
+    )
+
+    <!INFERRED_TYPE_VARIABLE_INTO_EMPTY_INTERSECTION_ERROR!>if (value == null) node.set(this, null)
+    else if (value is SomeJsonObject) Unit<!>
+
     <!INFERRED_TYPE_VARIABLE_INTO_EMPTY_INTERSECTION_ERROR!>when (value) {
         null -> node.set(this, null)
         is SomeJsonObject -> Unit
@@ -24,3 +31,4 @@ fun String.put(value: JsonObject?, node: ObjectNode) {
 }
 
 fun TODO(): Nothing = null!!
+fun <K> select(vararg values: K): K = values[0]

compiler/testData/diagnostics/tests/when/TypeParameterError.txt

@@ -1,6 +1,7 @@
 package
 
 public fun TODO(): kotlin.Nothing
+public fun </*0*/ K> select(/*0*/ vararg values: K /*kotlin.Array<out K>*/): K
 public fun kotlin.String.put(/*0*/ value: JsonObject?, /*1*/ node: ObjectNode): kotlin.Unit
 
 public open class JsonNode {

compiler/testData/diagnostics/tests/when/TypeParameterWarning.fir.kt

@@ -0,0 +1,35 @@
+// !LANGUAGE: -ForbidInferringTypeVariablesIntoEmptyIntersection
+// FILE: ObjectNode.java
+
+public interface ObjectNode {
+    <T extends JsonNode> T set(String fieldName, JsonNode value);
+}
+
+// FILE: JsonNode.java
+
+public class JsonNode
+
+// FILE: test.kt
+
+interface JsonObject
+class SomeJsonObject() : JsonObject
+
+fun String.put(value: JsonObject?, node: ObjectNode) {
+    select(
+        node.<!INFERRED_TYPE_VARIABLE_INTO_EMPTY_INTERSECTION_WARNING!>set<!>(this, null),
+        Unit,
+    )
+
+    if (value == null) node.<!INFERRED_TYPE_VARIABLE_INTO_EMPTY_INTERSECTION_WARNING!>set<!>(this, null)
+    else if (value is SomeJsonObject) Unit
+
+    when (value) {
+        null -> node.<!INFERRED_TYPE_VARIABLE_INTO_EMPTY_INTERSECTION_WARNING!>set<!>(this, null)
+        is SomeJsonObject -> Unit
+        else -> TODO()
+    }
+}
+
+fun TODO(): Nothing = null!!
+fun <K> select(vararg values: K): K = values[0]
+

compiler/testData/diagnostics/tests/when/TypeParameterWarning.kt

@@ -1,4 +1,3 @@
-// FIR_IDENTICAL
 // !LANGUAGE: -ForbidInferringTypeVariablesIntoEmptyIntersection
 // FILE: ObjectNode.java
 
@@ -16,6 +15,14 @@ interface JsonObject
 class SomeJsonObject() : JsonObject
 
 fun String.put(value: JsonObject?, node: ObjectNode) {
+    <!INFERRED_TYPE_VARIABLE_INTO_EMPTY_INTERSECTION_WARNING!>select<!>(
+        node.set(this, null),
+        Unit,
+    )
+
+    <!INFERRED_TYPE_VARIABLE_INTO_EMPTY_INTERSECTION_WARNING!>if (value == null) node.set(this, null)
+    else if (value is SomeJsonObject) Unit<!>
+
     <!INFERRED_TYPE_VARIABLE_INTO_EMPTY_INTERSECTION_WARNING!>when (value) {
         null -> node.set(this, null)
         is SomeJsonObject -> Unit
@@ -24,3 +31,5 @@ fun String.put(value: JsonObject?, node: ObjectNode) {
 }
 
 fun TODO(): Nothing = null!!
+fun <K> select(vararg values: K): K = values[0]
+